ABF guessing game

It's quite tricky even for a regular bird-watcher to differentiate the Asian Brown Flycatchers when one gets to see them under different lights and on varied perches.  I spotted these three different birds in one day, and all were the ABF.  I would put these down to adult, first winter bird and perhaps even a sub-adult in moult.
As usual its first sighting always creates some adrenaline rush of 'could it be ....', and then anti-climax sets in.  Ahhh, a birder's roller-coaster reaction!

An adult

Could be a sub-adult in moult.

A possible first winter

Perhaps a sub-adult in moult.